Fort Simpson climate by month
Averages and records for each calendar month at Fort Simpson, Canada, from 2003 to 2026. The warmest month is July, averaging 23.9°C; the coolest is January at −18.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −18.7°C | −26.8°C | 11.8°C17 January 2009 | −49.1°C14 January 2024 | 23 / 23 |
| February | −15.1°C | −25.4°C | 8.3°C3 February 2012 | −45.8°C1 February 2008 | 23 / 23 |
| March | −7.6°C | −20.4°C | 17.2°C19 March 2019 | −40.5°C9 March 2009 | 22 / 23 |
| April | 5.0°C | −7.1°C | 24.3°C20 April 2010 | −30.0°C5 April 2013 | 22 / 23 |
| May | 16.5°C | 3.0°C | 30.7°C29 May 2005 | −10.8°C9 May 2004 | 22 / 23 |
| June | 22.3°C | 9.3°C | 33.9°C27 June 2021 | −2.5°C6 June 2006 | 22 / 23 |
| July | 23.9°C | 11.3°C | 36.1°C13 July 2014 | −0.3°C16 July 2009 | 20 / 23 |
| August | 21.4°C | 9.1°C | 34.8°C10 August 2017 | −4.0°C27 August 2004 | 21 / 23 |
| September | 14.3°C | 3.0°C | 30.9°C7 September 2017 | −10.8°C19 September 2018 | 21 / 23 |
| October | 3.4°C | −4.1°C | 24.4°C4 October 2003 | −23.8°C26 October 2008 | 21 / 23 |
| November | −10.7°C | −18.3°C | 10.3°C1 November 2025 | −39.9°C27 November 2006 | 22 / 23 |
| December | −18.1°C | −26.2°C | 12.0°C2 December 2020 | −45.5°C23 December 2022 | 22 / 23 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 20 to 23 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.